What if I am using Claude as a rubber duck where Claude is the crowdsourced version of all the human thoughts on that topic. It is rerouting all the thoughts ever recorded on that topic through the chatbox to me. Something synergistic could emerge.
But in your own mind, your thoughts are still incomplete. The act of writing them down (or, I imagine, in an oral tradition somehow committing to a specific narration) is very important. IMO, when you delegate that to an LLM, you are not really thinking. It's the same as if you explained your ideas to someone (eg in an interview), and then they ghost wrote the work for you.